Personally I wouldn't agree with that.
The SE was the budget model, most likely came with strap door handles, vinyl seats, no demister and no radio.
CS was the more expensive model coming with cloth seats, foam handle door handles, demister and radio.
4 speeds were standard for these models. 5 Speeds were offered at an extra cost but didn't really come out till the XX KE55's. (Update 1980-1981)
And A/C was also an extra, very rarely seen.
I've got many brochures on them. I'll look it up tonight. Do you know what year it was??