MintLP Protractor for the JMW-9T tonearm

I was just about finished with my order of a MintLP protractor for my Scout's JMW-9T tonearm when an issue with the geometry of this particular tonearm arose. Yip from MintLP at first assumed the tonearm was the regular JMW-9, which has the same effective length as the Signature version. When I sent him a link to the description of the 9T from the VPI website to make sure he knew it was the upgraded version, he said he had made a mistake as the description stated that the 9T had the same geometry as the Rega RB-300 and could be dropped onto any Rega armboard. He suggested I contact VPI to get a definitive answer about the 9T.

So I did contact VPI and they responded that the 9T indeed has the same geometry as the Signature and the same as the Rega. So I'm now a little confused why Yip seemed to think the Rega RB-300 and the JMW-9 have different effective lengths? Is anybody familiar with the above mentioned tonearms and can confirm either way to settle this? I'd hate to waste over $100 on a custom made protractor if it's made on a wrong assumption.

Thank you.