Karl VI & Caroline of Ansbach

In OTL, there were marriage negotiations/overtures towards marriage between Karl VI of Habsburg, HRE and Caroline of Ansbach (branch of the House of Hohenzollern) but Caroline didn't want to convert to Catholicism and so they fell through. This has been discussed with regards to the effect of this marriage going through on Great Britainhttps://www.alternatehistory.com/discussion/showthread.php?t=266007&highlight=caroline+ansbach but what effect could it have on Austria & the HRE?

Suppose Karl VI and Caroline still didn't have sons and everything went the same as OTL, how would this affect Frederick the Great's decision to declare war for Silesia giving that he and this TL Maria Theresia are significantly more related? Greater ramifications on the War of Austrian Succession and the Imperial Election for HRE?
 
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