FiveAlpha
Retro Guru
There is actually a fair bit of difference between the two frames (relatively speaking).
The Banana is 'Raleigh 18-23', which is the cheapest, plain-gauge carbon steel that Raleigh used (similar to bottom of the range Peugeots, with their Carbolite 103 tubing). The stamped drop outs were also inferior, and they didn't have a derailleur hanger, requiring a mech with one of those steel plates.
The Kellog's Pro Tour used Reynolds 501 butted main tubes and (I think) Gipiemme drop outs - altogether a better frame, which isn't saying much, as neither was considered 'serious' at the time - they were seen as "children's bikes" (I know, as I had a Raleigh 501 frame in a different guise, as a teenager, and it was sniffed at by other members of my club).
The Banana is 'Raleigh 18-23', which is the cheapest, plain-gauge carbon steel that Raleigh used (similar to bottom of the range Peugeots, with their Carbolite 103 tubing). The stamped drop outs were also inferior, and they didn't have a derailleur hanger, requiring a mech with one of those steel plates.
The Kellog's Pro Tour used Reynolds 501 butted main tubes and (I think) Gipiemme drop outs - altogether a better frame, which isn't saying much, as neither was considered 'serious' at the time - they were seen as "children's bikes" (I know, as I had a Raleigh 501 frame in a different guise, as a teenager, and it was sniffed at by other members of my club).