Robot Framework having trouble evaluating expression with a colon in it

Question

I currently have a conditional statement with two variables in Robot Framework that have a colon(:) in the string. The evaluation fails every time. Both variables are strings and the same evaluation will work just fine in Python (':00'==':00'). I've tried an escape char \:00, I've also tried with just one zero :0.

*** Variables ***
${string_one}         :00
${string_two}         :00

*** Test Cases ***
Compare Two Strings
    ${type_string_one}=     Evaluate        type($string_one)
    Log     ${type_string_one}
    ${type_string_two}=     Evaluate        type($string_two)
    Log     ${type_string_two}
    IF      ${string_one}==${string_two}
        Log         Pass
    Else
        Log         Fail
    END