M20 flywheel conversion question (searched)

[BrandC]

So I'm trying to figure out if the early M20B27 (low hp) and M20B25 (88-91) single-mass flywheels are the same?

I may have secured a cheap single-mass flywheel, but I think it's from an '87 superETA. LMK if I should just stick to 88-91 to be safe guys.