Oh, and just enter these notes on a new track so that you can try diferent positionings and easily copy and paste to other snare hits along the song. It usually takes more than a break to create a whole song. There are no thumb rules for this other than experiment with break layering. First thing you'll notice is that some sounds are repeated. It probably doesnt need two kicks at the same time, so just keep the best.
Snares can colilide pretty easily too, so maybe some has gotta come out.
That way they'll mix together much easier, and allow you to later insert the missing kick and snare sounds from either the original sounds or completely diferent ones. Another thing is timing. Placing two diferent loops in the same tick wont probably work, since no two players play on the same timing. One usually has to be slide back by 3 or 4 ticks. If one loop is machine and other is organic, the real drummer will need to be placed earlier, to end up playing on the machine beat.