This is Block 8 on the Form 4419...
8. Check the box(es) next to the form type(s) for which you are requesting an additional TCC
Note: The IRS encourages transmitters who file for multiple payers to submit one application and use the assigned TCC for all payers.
Forms 1097, 1098, 1099, 3921, 3922, 5498 and W-2G (See Publication 1220)
Form 1042-S, Foreign Person’s U.S. Source Income Subject to Withholding (See Publication 1187)
Form 8027, Employer’s Annual Information Return of Tip Income and Allocated Tips (See Publication 1239)
Form 8955-SSA, Annual Registration Statement Identifying Separated Participants with Deferred Vested Benefits (See Publication 4810)
This is from the Form 4419 instructions...
Block 8 - Only check the box next to the form types for which you are requesting an additional TCC. A separate TCC will be assigned for each box checked in Block 8. Required.
(emphasis is mine)
So looks like you get different TCC's for each form. We have separate TCC's.