Backlink Discrepancy in Revived Site.

Hey all,

So, I revived an expired domain.
I resurrected the old site from web archive and everything went smoothly.
Bing webmaster tools says around 550 inbound links
google 179 external links
and ahrefs around 620 backlings.

What is going on? Why there is such a big discrepancy in numbers.
So, assuming i have made mistakes rebuilding the site correctly(http vs https, etc)
why bing shows so many links and google does not?
Shouldn't GSC give me error reports for those links that end up nowhere?
Does grc need more time to crawl a site. Site is almost a week old. I`ve got grc link reports,
3 days or so after i uploaded the sitemaps.

Thanks in advance

bump