I can't really disagree or agree since I hardly played CSS climb. From what I did play. it's hardly any different. That server I played on with you however, nid buy new maps.
GMOD and CSS have different jump schemes and speeds.
Gmod, you can jump higher, and generally can launch foward.
CSS, your jump height is slightly lower, and if you jump, you continue to move at the same speed, not suddenly accelerate at 10001234104MPH.
And you can't run in CSS.