Thanks for your inquriy. I have tested the scenario with your shared PDF documents using Aspose.Pdf for Java 11.8.0. In conversion of 1.Pdf, I have noticed a slight difference of colors in source PDF and resultant JPEG image. Please find attached the output image and confirm whether you have observed same issue or some else.
In reference to 2.Pdf, I have noticed the PDF pages images are not rendering in resultant JPEG images, so logged a ticket PDFJAVA-36160 in our issue tracking system for further investigation and rectification. We will notify you as soon as it is resolved.
Thanks for your feedback. I have logged a ticket PDFJAVA-36165 to investigate color difference in 1.PDF conversion. We will notify you as soon as it is resolved.