...
Gonna use coh2db for values which i guess didn't change:
0.1 on speed and 0.1 on acceleration doesn't have a meaningful impact in how a vehicle compares with another (M4 vs PIV), rotation is equal to Cromwell (while this is the fastest of them which is fine cause is lacking in several other departments) and 76 is both slightly faster 0.2/0.2 and rotates better (32 vs 36). Luckily for the PIV, it has a more impactful vet 1 ability which let's it gains more mobility when needed (Cromwell requiring Hammer).
If that's not similar, well i guess they don't have similar armor values neither.
Su76 is between a Puma and a Stug, role wise (Anti light, soft anti medium). It's funny you mention the Su76 cause everyone knows it has one of the worst mobilities due to pathing.
Tiger is faster than IS2. You might have seen TA or KT, both of which are in a different category. KV2 is a low freaking tank as well and might be comparable to KT as it was made to be less and less reliant on artillery mode to be useful.
JT hasn't been updated. (3/1.2/16) so it's closer to the Ele (3.3/1.4/16). ISU (4.5/1.4/16).
If i may say something: the most important value to look at vehicles is acceleration >= rotation >>> speed. Most of the time, vehicles are not able to use their max speed unless running away through roads or during long straight chases. Rotation is what enables vehicles to maneuver and actually be able to roadkill models.
There are things which are equivalents and others which are "premium" or slightly above or below each category.
The // separation denotes a slight change in role/weight/cost/Vet requirement/etc.
Light: Stuart, Aec, // Valentine, Puma, Su76,
Medium TD: M10, Stug // JPIV, Su85, Jackson, FF
Medium: T3476, Cromwell, M4A3, PIV, M4C-76mm, // OKW PIV
Premium/Advanced Medium: E8, Bulldozer, T3485, Brummbear, Comet // Panther, KV1 // Pershing
Heavies: Tiger, IS2, TA, KV2 // Churchill // KT
Super heavies: ISU152, Ele, JT
Might have miss some vehicle (i didn't count Kv8, Scott, Centaur, Ostwind, etc. on purpose).