That's a very good question and it's not so easy to answer. Basically you always upvote with the same amount that you vote on hive. So a 100% upvote in hive will also be a 100% upvote in CTP.

However if a post doesn't carry the ctp tag, this means that there won't be an upvote in CTP and your voting power in Hive and CTP will be different.

You can see your voting power in leodex.io/rewards for the different coins.

There is also a magical way to work with and it's vote weight multipliers. But I would need a specific post to explain this one :-)