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As for your first question: I would be very surprised if the migration tool would get upgraded. Upgrade paths needing intermediate versions are pretty common with Oracle. I'd plan to have the intermediate version around for as long as your migration lasts.
As for the second one: from my limited experience, importing 188.8.131.52 exports into 184.108.40.206.0 works fine, or better: not worse than 220.127.116.11.0 to 18.104.22.168.0. There are issues with importing scenarios, but those have been around a long time. Regenerate the lot after import. (Do it in a procedure, that will save you a lot of time).
If you import into an execution-only repository you can't regenerate. In that case pray to the deity of your choice.
And please use Smart export/import.
Tnx a Lot