Measure the diameter of the fill neck of your CB bladder. Someone will be along with the diameter of the Source bladder fill neck.
FWIW, the QD attachment on CB and Source products is essentially the same, so bite valves and other accessories can be switched from one to the other.
The neck opening on most CB bladder carriers holds the bladder in an upright position. Measure the diameter of the opening in your bladder carrier, and report back. The substitute bladder--no matter the mfr-- must be the same size in order for the bladder carrier to "trap" the bladder's neck and hold it.
Some bladders and bladder carriers are designed without a neck opening. In this case, a panel usually unzips or un-velcros to expose the fill neck. with this system, the bladder is usually suspended within the bladder carrier by some sort of strap or hook.
It's not always easy to change brands of bladder from one bladder carrier (originally mated to the bladder) to another carrier not originally intended for the original bladder. Not impossible, but you might have to get creative.