MOS Technology started development of the 6530 RRIOT very early after/during the 6501/2 development. All in 1975.

The first version of the Hardware Manual has this mention of KIM and TIM:

The KIM and TIM were mentioned as Keyboard and Teletype Input Monitor, indicating these are the 6530-002 and 6530-004 RRIOT IC’s. Indeed these ICs were sold later on.

The KIM-1 computer was developed later, with the KIM RRIOT and the 6530-003 audio cassette interfacing ROM using the KIM 6530-002 RAM and I/O ports.
The KIM-1 was not called -1 as first version, but for the 1K RAM included on the computer.
First shipping of the KIM-1 started in early 1976, then the first articles in the magazines and advertisements appeared.

So KIM is the 6530-002 RRIOT IC, KIM-1 is the computer around the KIM and 6530-003.