IME - The biggest differences between brands made by same overseas mfg is quality of the sub components purchased by mfg.
Doesn't mean these sub parts are not made overseas, just means they set different minimum standards.
Powermatic requires Baldor branded motors , Westinghouse motor starters. Delta has similar requirements; no Chinese private branded motors (Baldor/Marathon), electronics, or bearings. Most US OEM require US, Japanese, S. Korea, branded bearings; which despite the company headquarters location, will usually come from plants in Taiwan.
Grizzly/Shopfox/Craftex/King/etc OEM save money by allowing the mfg to choose the lowest priced source, with some general requirements for reliability. Typically the min rel standards force the mfg to use above average quality parts, and not cheapest available when made in China.
Please note that Geetech is not only mfg the OEM's use. Which one they use depends on type of equipment. Geetech is famous for Saws, Planers, and Jointers. Roughly a dozen folks make band saws, and almost hundred folks make dust collectors. Lathe production is sort of a niche business with many folks involved too. Sourcing is a constant merry-go-round of who mfg, what, right now.
Really want to know the reason all these tools are same?
Simple: Competitive bidding.
When company wants to new tool model, they ask ALL the known mfg capable of meeting existing quality standards to quote on a drawing package.
There are literally no secrets in sub-contracting mfg of tools. Everyone of the overseas mfg knows what every mfg wants in a tool. If one overseas mfg offers a cost saving design change, the OEM pushes it out to everyone. Yes, each OEM has non-disclosure agreements in place, but all it does is delay the spread of information by a year or two. Doesn't help that employees in Taiwan will change companies for 10 cents more an hour, and they are all in same area. So the engineering staff inside the tool mfg have usually worked for the other guy(s) recently too.
The game played by actual overseas mfg is to tool up the mfg capacity to support making tools for anyone with minor modifications to machining, stamping/forming, or the color of furniture. Then they bid on projects to keep factory full, lowering prices as needed as long they make money.
When long established Geetech couldn't make money in Taiwan, they partnered/opened plant(s) in China. In some cases the entire machine is made in China, and others the major parts are made in China and shipped to Taiwan for assembly. Majority of low end Taiwan made tools use cast iron from China due lower costs. The name of game is leveraging investments to make money. Capitalism in it's finest form.
BTW - The entire tool mfg world was twisted violently with the USA tariffs last year. OEM had spent a ton of effort moving stuff from Taiwan to China last two decades, pushing China quality up to acceptable level. Taiwan mfg costs can be only 10-15% more than China with right design and sourcing plan. So when the China tariff hit, Taiwan suddenly become cheaper, and there has been wholesale effort to move mfg back to Taiwan. Harvey Industries in China had exclusive on Sawstop, until tariffs hit. The also used to be key mfg for Powermatic/Laguna lathes. If you look closely at latest PM/Laguna tools, the labels say made in Taiwan? Sawstop added Geetech China operation in last 3 years, primarily to produce the low end job/contractor saws with less margin, but I would not be surprised to see made in Taiwan labels on PCS? Geetech has one mfg plant dedicated to building bench top tools like lunch box planers, and are primary mfg for Dewalt planers. :-0)
Speaking of primary: Note that OEM never put all it's eggs in one basket. Typically large orders are split 80:20 or 70:30 between two sources. This serves three purposes. One to create higher capacity if demand exceeds plans. Two - offers a back up in case of calamity. Three - to lock in pricing competition. When demand is not large enough to be split; they will rotate order placement between mfgs to ensure they all are tooled and capable of meeting demand (when carp happens). Rotations tend to occur annually with model years, or model change overs. Now maybe all those confusing Jet/PM 6 digit stock numbers for same tool make sense? lol
FWIW - Spent 30 years in deep dark world for 'off shore sourcing' before retirement. It's a strange place. Have had the privilege of visiting several wood working tool mfg in my career, not for WW tools, but while I was hunting for quality machine tool builders for custom designed automated assembly equipment.
So not an expert and the above could have changed by time you read this.
Thanks for letting me share.
YMMV