Fresh New Codes P0450 & P0447 on 97 Nissan Sentra

This Sentra has thrown evry Evap code in book namely because the snow and ice had its way with the low hanging Evap setup.

So i started with the P0443 and 446 which are both purge / vent malfunction , ive replaced both of those. the vent ctrl was first changed to a 98 setup basically the larger canister that was used on the Max, because i couldnt get the 97 setup smaller canister as the vent control solenoids arent interchangeable. It failed. However i finally got my hands on a 97 setup and replaced it and the code cleared .

Now after a quick run with it tho two other states MA >VT >NH>MA with a bad clutch im back with fresh new codes 450 and 1447. honestly p01447 was on before the state line. i grab the code scanner when i got back and found p0450.

These years seem to use 2 map/boost senors for the evap sys one in the front the one back ive never touched the one in the front but ill prolly change/ swap the back first and see what happens. As for 1447 evap/ purge monitoring prolly something to do with the map/boost senors. I know the front on goes straight down whiile the back one has a right angle but dont figure to many of those go bad.

Any thoughts or suggestions would be helpful ,especially on those boost senors are the years the same ,are the numbers the same are the front and rears interchangeable.Is that what tripped the p01447 code?
First let me thro a clutch in it ,then ill get back to playing Evap tech. meanwhile ill be checking around.