By compatible, what do you mean? Weight, rigidity, ease of use etc?
I found my 18 foot CL-X acceptable on weight and rigidity, but I suffered my 22 footer for too long. Very whippy. It did the job but required a lot more effort than my current 25 foot SL-X. I suppose if you weren't using it fully extended most of the time it would be ok. There are quite a few on here that use them as their everyday poles.