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If you mean these inserts then I suspect you are probably right as the qr ones seem a lot flatter which would account for the difference in width.
I wondered at one point if I could do this with my Kona Unit which is 135mm qr and I believe the Unit X is 142x12 TA and the frames look pretty much identical. The inserts are a bit pricey and I kind of went off the idea so I never got round to trying it.
Question, if I space my dropouts to 142mm, I can with Paragon inlets go down to 135 mm OLD (and QR)?