I can tell my boys apart quiet easily
Mine are both agoutis but they have big differences in looks and personality although I am the only person who can tell them apart, everyone else thinks they are identical.
These are their differences:
Cookie -
Smaller
Pointier face, more like a mouse's
Never leaves the nest in the day
His black undercoat is much more obvious, so he looks darker in colour
His fur naturally sticks up
He is faster and harder to catch
He has never made a sound in his life
Truffle -
Bigger
Square face more like a guinea pig's
Longer body
The only one who you see during the daytime
Black undercoat not so obvious, so his fur looks lighter in colour
Very smooth coat
He is more laid back and not as energetic
He is a little more tame and easier to catch
When you pick him up he squeeks
Once you get to know them its very easy to tell them apart they all have their differences
Its the same with my winter whites, they look identical at a glance but they have tones of differences