First of all Feb is in Q1, not Q2. Secondly, and most importantly, though I'm sure there are some internal targets for the dev teams in terms of release dates for HOI and Stellaris, it would be absolutely nonsensical to be shuffling them around the calendar as you suggest this early in the process (late alpha) for commercial reasons. One or both could still hit significant delays, so if for a brief moment it appears they might finish simultaneously they aren't going to slow work on one to let the other get out the gate first.
Of course if that situation persists into late beta and it is obvious the products will be ready at about the same time, there are understandable commercial reasons to delay one release. Until such an eventuality, I'm sure both teams are moving full-steam ahead.