A difference of 25 BPM will be a challenge if you are familiar with the source files and you are not using filters/distortion to mask artefacts etc.
Oddly enough the very best I have come across for time stretching without artefacts is Acoustica; https://acondigital.com/products/acoustica-audio-editor/
It's a pain in that you have to work out exactly what the source tempo is and then stretch/compress it in a different app and then import to your DAW (no tweeking on the fly) but it's soooooo clean.