Chapter encode quality differs from full-length qualtiy

[protectron]

Interesting. Yes it was an x265 2-pass at 2000kbps. The settings for the full-length encode were straight default when initializing Hybrid, unmodified. 
I made modifications from there for the chapter encode, such as higher --rd, --me, --subme.
The chapter was 6:56 minutes which I thought would be enough to average out the bit rate.

Is there a way I can see what an output will look like when using 2-pass for a short sample, like a chapter, without doing a full-length encode?

x265 --input - --output-depth 10 --y4m --profile main10 --limit-modes --no-open-gop --opt-ref-list-length-pps --lookahead-slices 0 --pass 1 --no-slow-firstpass --bitrate 2000 --opt-qp-pps --cbqpoffs -2 --crqpoffs -2 --qpfile GENERATED_QP_FILE --limit-refs 0 --ssim-rd --psy-rd 2.50 --rdoq-level 2 --psy-rdoq 10.00 --aq-mode 0 --deblock=-1:-1 --limit-sao --no-repeat-headers --stats "C:\Users\Michael\AppData\Local\Temp\movie_generated.stats" --multi-pass-opt-analysis --multi-pass-opt-distortion --analysis-reuse-file "C:\Users\Michael\AppData\Local\Temp\movie_generated.analysis" --output NUL

x265 --input - --output-depth 10 --y4m --profile main10 --limit-modes --no-early-skip --no-open-gop --opt-ref-list-length-pps --lookahead-slices 0 --pass 2 --bitrate 2000 --opt-qp-pps --cbqpoffs -2 --crqpoffs -2 --limit-refs 0 --ssim-rd --psy-rd 2.50 --rdoq-level 2 --psy-rdoq 10.00 --aq-mode 0 --deblock=-1:-1 --limit-sao --no-repeat-headers --stats "C:\Users\Michael\AppData\Local\Temp\movie_generated.stats" --multi-pass-opt-analysis --multi-pass-opt-distortion --analysis-reuse-file "C:\Users\Michael\AppData\Local\Temp\movie_generated.analysis" --output "C:\Users\Michael\AppData\Local\Temp\movie.265"