As you see above, they are not the same. Hodgdon has tested H4895 with the 60% reduced loads and they are safe. They haven't tested IMR4895 and they do not recommend using it for reduces loads.
At least you didn't waste money on the IMR version because it's a very good powder for standard 30-06 ammo and of course others too. IMR4895 used to be THE 30-06 powder. I now use H4350 for standard 30-06 ammo.
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