Based on the bandwidths MODIS bands 1 and 2 (620nm - 876nm) will match S3 bands Oa7 - Oa17 (620nm - 865nm)
I am just trying to know if anyone had any experience in using S3 data instead of MODIS for any image processing?
I'm not really sure what you're asking. This will of course work as OLCI has the same bands and MODIS for NDVI. You will have to apply a suitable cloudmask, however.