Yes, you are right.
There are 2 versions:
1. Older version:
- Text and number on the outer cover in black
- "color climax" text on the inner cover in different color
2. Newer version:
- Text on the outer cover in one color, the number in yellow
- "color climax" text on the inner cover in one color
The matching outer cover for the posted inner cover (the number in yellow):
Tuffy