Third image down, the dark blue stroke bounding the mid blue underline has significantly reduced thickness. Seems to work correctly with clist, badly without.
Black frame surrounding light gray background of the text box, again the stroke is noticebaly too narrow. Again seems to work correctly with clist, but not without.
The PDF file produced by the pdfwrite device renders correctly in Acrobat, and when using the clist, but when not using the clist there's a missing orange stroke surrounding the sunburst which brackets the 'TE' in 'ORTEGA'. Robin opened a bug for this one here https://bugs.ghostscript.com/show_bug.cgi?id=702131 with a simplified file.
The PDF file produced by the pdfwrite device renders differently with Ghostscript and is (subtly) different when exported to TIFF from Acrobat. There appears to be a bug for this one already: https://bugs.ghostscript.com/show_bug.cgi?id=702033 However there's no progress in 6 weeks. In addition I see differences when rendering the PDF file in Acrobat and with earlier versions of Ghostscript.
The PDF file produced by the pdfwrite device after the filll+stroke commit renders the blue lines considerably darker than the PDF file produced before that commit. Acrobat displays both PDF files apparently identically.
Looking at this I see that there is a bug, but it appears (to me) to be a long-standing bug in pdfwrite, which is not tracking overprint mode properly. I have a tentative fix, but this is not a regression so I don't think we should hold anything up for this.