The CT equipment, other than weapons and craft, generally is descriptive only, not mechanically derived, so porting it over is essentially a non-issue. The stuff which is mechanically relevant is already ported by Mongoose.
Weapons stats are quite different. All the CT weapons are ported already between MGT Core and Merc.
Vehicles other than ships - the core ones are already done, and the rest are best redesigned rather than ported, since the design rules are totally alien to each other. (Striker versus Sup 5).
Bk2 Ships can be ported directly, with a couple minor caveats. Smaller ships gain due to lower fuel tonnage and no computer tonnage. Bigger slow ships (800Td+) tend to lose a little bit due to larger fuel requirements. And MGT core caps at 2KTd, rather than CT's 5KTd. Also note that Bk2 designs are not directly limited in performance by TL, but by maximum drive sizes (which are TL limited).
Bk5 ships don't port so easily. I haven't bothered to work with MGT HG. But, in general, Bk5 designs should be redesigned. Note that smaller ones can be used with the MGT mechanics just by calculating hits, but that isn't so much porting as making do - it won't give the same performance.
Then again, i'm one of those who would MUCH rather that MGT had been built on HG rather than the Bk2 derived ACS.