As gary said, all BTR-70's originate from the DML molds. Revell just has better decals.
To make one most accurate, build it from scratch!

(ok, just having fun.)
The DML kits are ok, but long in the tooth. You are going to need to get a PE set for them, probably Eduard, and new resin wheels. The rubber in the kit wheels seems to give people fits. Other than that, get some good references off the internet and add details as you see fit, you should then see what I mean about why the model should be scratchbuilt.
Also, there is
this link that shows the work "Silantra" is doing on a BTR-70...