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A number of people have drawn comparisons, but I decided to do one of my own formalizing the process, laying out exactly what I did, and getting scale more exact.
 
Blue ink is the direct comparison.  
Green ink is working off of a citation >>395227 to get the height in cm.
 
It’s kind of funnily like a general relativity problem, in that the units you use to measure the objects vary (pixels), but relationships within the objects don’t vary across coordinate systems, so you identify something that doesn’t vary (like the line in-between the front of the nostril and the front stroke of the ear) and use those as a measurement in-between coordinate systems.
 
Another data point to add here: >>991140

safe2294079 artist:deathnyan101 artist:eagle1division227 artist:geometrymathalgebra51 derpibooru import1709089 screencap295548 rainbow dash300231 equestria girls275994 friendship games14842 friendship is magic4247 analysis260 clothes684992 compression shorts1536 cute267996 dashabetes13173 double rainbow132 feminism2041 height62 humans riding ponies711 math981 my little pony3380 rainbow dash is best human126 rainbow dash is best pony584 science1391 shirt45452 size comparison1141 sweatshirt773 t-shirt7894
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Anonymous #B45B
In my headcannon, they meet and bond as pals. And the long one be in pony form. It be sweet to see the human one befriend her when some mistreat animals and shorter people.