Comparing Kasaba and Iktasaba

Six Semantic Functions of Form VIII (Iftiʿāl): Adoption, Exertion, Selection, Response, Equivalence, and Independent Usage

The radical sequence kāf–sīn–bāʾ remains the same while the pattern changes.

AspectSimple formForm VIII
Pastكَسَبَاِكْتَسَبَ
Source glossEarned/acquiredSought to earn/acquire
PatternForm IForm VIII
HighlightAcquisitionEffort toward acquisition

The point of this source comparison is the semantic shade, not just the additional consonant in the verb.