can i use a trajectory and align it to the same protein structure saved in another pdb file?

[hima111997]

assuming that i have 3 xtc files with N frames and i want to align all of them to the same protein structure. however this structure is saved in another pdb file. can i do this?
will it work if i added this structure to one of the xtc files as the first frame then used:

ttclust -f xtc1_with ref xtc2 xtc3 -t top