No, there can't be any straight conversion factor, since these architectures are different and have different performance characteristics.
XP2400+ is probably not too bad overall comparision. But your 533FSB P4 probably has an edge in games.
I have one (rebuilt old 600MHz) XP2200+ and one old 2.4P4(400). XP2200+ feels quite nice to me. Could be due to its 32.2 in business Winstone 2002.
Your P4 should score something like 30, the XP2400+ scores 33.6.
But with it's media extensions, the P4 outperforms XPs in such apps. Content Creation 2003 scores are about 43 for the 2.4P4, against 36 for the 2400+. I would assume the difference is less in Winstone2004, but I don't have any scores for this.
Keep in mind that you can't even compare AMDs with AMDs. Semprons, A-XPs and A64s are all on three different performance ratings. Performance is highest for A64 and lowest for Sempron, for similar ratings.
Intel, same story or worse, with GHz. M > 6x0 > socket478 > 5x0 > P4B > P4 > "Deleron" >> Celeron.