Oh oh. These two.
Did you guys notice that Colin's character has visually changed from how he originally looked? He has a soul patch of facial hair when before he didn't. I wonder if this was done because they thought his character might confuse some to thinking he is Gray? Or maybe just a passage of time and characters can change their looks.
Murphy looks the same though, just more refined, like they have an official character design now.
Full Size

I also just now noticed Colin's ears are oddly shaped compared to every other pony. It seems to be a design choice or have some meaning, because it was that strange shape even in the early episodes with him in it.