The most simple way to differentiate between a regular Session Account ID and a blinded Account ID is by looking at the beginning of the ID.
A regular Account ID begins with 05.
Example: 056fdf36e5a825afdaa73762daf5873d18ad7a230a8ee9dbf1e0b7d41e2322cc4a
A blinded Account ID begins with 15.
Example: 156fdf36e5a825afdaa73762daf5873d18ad7a230a8ee9dbf1e0b7d41e2322cc4a