Even so, each and every one is indistinguishable (3,3,4)
I believe the answer is:
all the same
'even so' is the definition.
(synonyms)
'each and every one is indistinguishable' is the wordplay.
'each and every' becomes 'all' (I've seen this before).
'one' becomes 'the' (both can introduce a definite example of something).
'is indistinguishable' becomes 'same' (similar in meaning).
'all'+'the'+'same'='ALL THE SAME'
(Other definitions for all the same that I've seen before include "Not material" , "In any event" , "lacking in variety" , "like clones?" , "even so" .)