If I'm not mistaken, IMR does call their powder IMR 4895.
Yes, they are different. The temperature response difference alone means there is a good chance they will cross paths (produce the same peak pressure in a cold barrel) at some one ambient temperature, but no other. Same peak pressure, by the way, does not automatically mean same velocity, as that also requires same burn rate and same energy content per grain of powder weight, as well. Neither will match exactly, so velocity is not a suitable pressure indicator when swapping between the two.
I think it was Denton Bramwell who commented that once the barrel heats up, pressure rise in rounds often has more to do with the warm chamber passing heat through the brass case head to the primer than to the temperature of the powder (which takes longer to rise, as it is somewhat self-insulating (my explanation, not his)). This means, if the gun is hot, don't let rounds cook in the hot chamber before firing. Fire promptly after chambering a warm tube.