Yes. You should have made a backup of your original JJ2, so just use that to join 1.23 games. If you didn't make a backup (and only have the patched version), just reinstall 1.23 into a different directory.
1.24 can't join 1.23, and 1.23 can't join 1.24. So the answer to what you are asking is really "No." But you can still join 1.23 games with an unpatched 1.23.
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With our extreme gelatinous apology,
We beg to inform your Imperial Majesty,
Unto whom be dominion and power and glory,
There still remains that strange precipitate
Which has the quality to resist
Our oldest and most trusted catalyst.
It is a substance we cannot cremate
By temperatures known to our Laboratory.
~ E.J. Pratt
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