Quick question

[Re_Minder]

Is it the same to give 100 florins for 10 turns to, let's say, the Pope, and to pay a tribute of 100 florins for 10 turns in terms of improving relations?

[SonofPeverel]

Yes

[Dahoota]

In terms of them accepting that negotiation and immediate relations, yes.

Although factions are less likely to attack or break an alliance with you while you are paying tribute to them. Your good relations with them will be improved for longer while you are paying tribute to them as well.