Compare two columns in different Tables using DAX

I ahve two columns in tweo different tables connected -M to M relationship, and I would like to compare the text from the columns to see which ones match or not. I tried a "solution" given here some time ago, but is not working properly. It doesn't diferentiate between match/no match, giving only one value. Here is the script used: 

Equal value seq =

CALCULATE(

var __MWseq = SELECTEDVALUE(PM_details[sequencedescription])

var __REFseq = SELECTEDVALUE('Reference Table'[Description of Task Sequence])

return

if(__MWseq =  __REFseq, 1, 0),

USERELATIONSHIP(PM_details[idassetpm], Assets_extended[__id])), and the result. What could fix the issue! Many thanks !

Some records match, but the formula doesn't show it.