Differences between a 69 and 70

[BOSS]

uhm...well this is Michael, James's son. and I was wondering what the differences are between a 69 and a 70 Chevy truck. I know the differences between all the others, just not those 2. so yeah...sorry if this is already posted somewhere else, but it would help, cause I hate saying, "yeah that is either a 69 or a 70"...I wanna be able to say "yeah, that's a 69" or "yeah, that's a 70"...so if anyone knows...any little details would be appreciated...thanks a bunches.