Do cultural conversion bonuses stack?

[Shoebopp]

For example, having a Hellenistic Colony in a settlement with a high-influence governor. Would this cause conversion to skyrocket or is there some strange calculus going on? Maybe the game chooses the higher conversion bonus?

[Grimmy]

I'm wanting to know this too.

[QuintusSertorius]

Yes, I believe they do.

[Grimmy]

Yes, I believe they do.

The danger of asking compound questions.

Which part is yes?
1. stacks?
2. picks best?

[QuintusSertorius]

They stack.

[Grimmy]

thanks.