I don't have ootp14 installed on my computer right now, but somewhere under the game or league settings, you should be able to export your league as a template.
I'm not sure templates will keep the history/stats of your league though if that's what you want, but I'm not sure because I haven't tried it.
ootp14 templates do import into 15 just fine though.
Why don't you just import your league into 15 and save it as a template in 15, then add it to your other league.
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