Don't even think there is even such a tank called T-72BM1. There is the T-72B(M) which is a T-72B equipped with Kontakt-5 ERA.
Here is a pic of a T-72B(M) 1989 model, you cans see the differences. Tanks in the background are T-72B fitted with Kontakt-1 ERA.
http://img98.imageshack.us/my.php?im...2bmby031sn.jpg
I regards to armour, Relikt is 80-90% superiors against LRP then the Kontakt-5, and just about the same against HEAT type warheads. So takes a T-72B without ERA and add the values up. Heard that Kontakt-5 adds around 150-180mm against LRP and about 350-400mm against HEAT. Relikt would be like 250-300mm against LRP, or somewhere along thoses lines. It's also features an anti-tandem warhead capability unlike the integrated Kontakt-5 ERA fitted on the T-72B, T-80U and T-90. It is also of modular design, allowing for quick removal and installation by field personnel, or crew.
The T-80BM seems to retain the current FCS as the older T-80B, only noticable difference is that it fitted with Relikt ERA, giving it more or less the same amount of armour as a T-80U with Kontakt-5 ERA. So it should have about 700-750mm of frontal armour against LRP or around that. Greatly increasing its survival in a modern battlefield.
Here's a pic.
http://img524.imageshack.us/img524/8...drelict1hx.jpg
Edit: Also coverage of the frontal turret has improved from 50% on the T-72B with Kontakt-5 ERA to around 60-65% with Relikt.