Absolutely not. I never switch a tin to a jar. I would if I noticed that a tin wasn't sealed. Just try to open it periodically. If it is still vacuum sealed, you should not be able to open it with your bare fingers. To jar a sealed tin is completely unnecessary.
And, after I pop a tin, the tins seem to slow down drying quite a bit but not dry it quickly. And, since I prefer to dry my tobacco anyways, I don't let it bother me. And, I don't want to carry around a jar with me like a moonshine drinking hobo.
Sometimes, I will transfer a round tin to one of the empty rectangle tins, because they fit in my jacket pocket much easier.
But, if you are worried, or anxious in any way, do what gives you peace of mind.