No difference. 
$ perl -E'say "aaa" =~ /a{2,}/'
1

$ perl -E'say "aaa" =~ /a{2,1}/'
Can't do {n,m} with n > m in regex; marked by <-- HERE in m/a{2,1} <--
+ HERE / at -e line 1.

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In reply to Re^5: Oddness with regex quantifiers by ikegami
in thread Oddness with regex quantifiers by talexb

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