what is it- bass drum heads assume a wide wood hoop whereas a tom head assumes its going to fit into the thinner channel of the metal ..hoop.
So while a tom head will work on a bass the reverse might not.
If the channel fits wear it ; )
oops wait; forgot about the collar differences.
Just grab another shirt!
I don't think any head I've put on either of my 18's ever actually said "bass drum" on them (now I'll have to look!).
I had heard that bigger collar thing in the past, but I once got a tom head when I ordered something for my 18" LCM bass and used it anyway....no problems, but it did seem to tension a bit quicker.