There is no difference.
Most 10.7s are frontally penned by HSTVL, same as 2S38.
Welcome to their BRs.
HSTVL doesn’t have a lack of ammo for tanks. It has over 12 frags worth of ammo.
If I check your stats will I see 12:1 KDRs everywhere where you genuinely have a concern about 26 rounds? Let’s find out.
I see 3:1 with T-80, and ~4:1 with M4A2. That’s 6 - 12 shots fired from HSTVL on average.
The amount of ammo in HSTVL objectively speaking does not concern your stats, you’re not enough of a player to use even half of the ammo on average.
I’ve yet to use more than half the ammo in HSTVL in any match and I’ve done 22 matches so far.
I’ve used half the ammo in exactly 1 of those 22 matches when I got 6 frags against Leopard 2A5-7s and one Mi-35M. So the ammo count does not concern me either.
My average ammo use in HSTVL per match is like 5 rounds fired, I do bring full ammo for the mythical 10+ frag match.