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Yes, you can open 2 projects at the same time.
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If the tracks are named correctly you should be good.
I recently had to do this and the midi file opened just like the song it was exported from.
All tracks had their names etc…No dissolving required.
Another way…export the tracks as “midi loops.” Ahh but you have 42 tracks to export.
I just did this the other day, only needed to export 4 tracks though,
but bringing them into the new session was very easy.
Probably other ways of achieving this as well.