I encountered the following sentence:
I looked up the entry on Pleco, and although it shows the meaning, it also redirects toward 以沫相濡, which seems to have the same meaning (as well as 濡沫).
So I wonder whether it is OK to assume that these are just synonyms and have no difference, or have any meaningful (even if tiny) difference.
Also, is this kind of Chengyu (the first and last two characters are flipped) common? And if it is practically same, why do these different forms exist in the first place?