[Q] How to tell model numbers topic

Ok i want to buy the Lg90 from walmart (the straight talk version) does anyone know what model number that one is ? for example im asking if its the d415 etc... P.s i looked all over on how to find out which one is which.

Also does anyone know which model number the boostmobile version of the phone is?

Please be certain because i dont want to buy a phone only to find i cant root or worse yet brick it!! thanks guys