He’s very cute! I love his little mustache! I’d go with more of a Birman lookalike than a Ragdoll lookalike, because a Ragdoll would have longer, thicker fur. Unless you have pedigree papers or get a DNA test done on him, he would be considered a Domestic Longhair; blue point mitted for the color.
You won't go wrong with a Birman or Ragdoll. The main difference between the two would be that Ragdolls grow much larger than Birmans and also have a bit longer coat, especially around the face, I think. They both have sweet temperaments and gorgeous. Is he spraying already?