We do not condone piracy. However, if you own the original PAL PS2 disc, you can create a backup ISO using (Windows) or dd (Mac/Linux). Once you have the ISO:
Modders have patched some of the minor sprite flickering issues present in the original Midway ports. Conclusion: Is the PS2 "ISO" Better? mortal kombat arcade kollection ps2 iso better
Also, the PS2 version has no “training mode” – but neither did the arcade. The 2011 version didn’t either. Review — Mortal Kombat: Arcade Kollection (PS2 ISO)