If you are just looking for the explosive damage as in whole body damage, you can use the RE of Comp B and do the math against the damage C4 does. Comp B has an RE of 1.01, so in the quantities you list it won't be much different.
If you are looking for how much damage the fragments do, you will need to do more math using the Gurney Equations to get the speed of the fragments and then make a guess on fragment size and run the EFactor numbers from there. I think the spherical model would still apply for just about any hand grenade. The cylindrical equation is generally used for bombs.
I hope this helps.
