The tag alias #61774 st3ph3n -> pinkgirlpen has been approved.
Reason: https://www.furaffinity.net/user/st3ph3n
(in the user description says that will changed to pinkgirlpen)
With this evidence it seems that both tags are from the same artist.
Topic: Tag alias: st3ph3n -> pinkgirlpen
Posted under Tag Alias and Implication Suggestions
Proposed this as a BUR a couple months ago in forum topic #36667 and it had unanimous support on that thread. It seems to still be pending approval, though.