WISC/CAT scores disparity

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My DD (just turned 10) is AuDHD and has just been diagnosed with dyslexia and dysgraphia.

These were diagnosed in an EP assessment for a refusal to issue EHCP appeal. As part of that, the EP did WISC V and WRAT testing and she scored:

FSIQ: 116
FRI: 123
VCI: 108
PSI: 108
WMI: 117
VSI: 97
Sentence comprehension: 121
Word reading: 106
Spelling: 91

She has also just done the CAT tests at school in part to supposedly give an indication as to 11+ potential (we're in a top 25% Grammar area).

She scored:
Verbal: 113
Quantitative: 93
Non-verbal: 106
Spatial: 88

I know they're not directly comparable, but there's quite a large disparity between the two sets of scores. Any thoughts?

Lots of things can affect results. For example, the EP assessment would have been 1:1 but were the CAT4 tests done in class or in a group? Things like the day, time, mood, environment, etc. can also affect the results. CATs rely more on reading ability than the EP assessment. I have seen far, far larger disparities. I wouldn’t worry. The EP assessment is more comprehensive.