As the error message obviously states, it means there's a conflict between the two packages. You can't have both of them installed at the same time.
If you take a look at the description of poppler-utils, you'll find that it provides alternative versions of the xpdf-utils*, all based on libpoppler.
So you already have pdftohtml installed on your system; just one from a different different source.
*xpdf-utils is the package that provides the original version of pdftohtml and other pdf-related utilities. Either way, it's not really necessary to install it separately.
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