Equally, the transcription of the marriage gives the groom as William TOPLAS. I don't think the name IOPLAS exists ... apart from the aforesaid William, the only other IGI entry is in Peru!
It appears that the other Elizabeth WHILEY may have married a Toynton HARDY in 1831.
Your only chance of deciding which Eliza(beth) was which may be clues given in the names of the children (if they match parents' names). As sillgen said, it's a dodgy business.