My son was tested on the WISC-IV at 9 years-11 months.
His results are as follows:

Verbal comprehension
Similarities 19
Vocabulary 16
Comprehension 16

Perceptual Reasoning
Block Design 18
Picture Concepts 10
Matrix Reasoning 13

Working Memory
Digit Span. 12
Arithmetic 14

Processing Speed
Coding 8
Symbol Search 14

Verbal Comprehension 146
Perceptual Reasoning 126
Working Memory 118
Processing Speed 106

Any insight to understand the gaps between VCI and PRI?
Thank you