Harrys is great I have the Winston works good for me.There's no distinction on their site, if you want refills the only question is quantity. So I would think that both handles use the same blades. They use the same photo and description for each.
I use a schick disposable triple.
Same price for 6 of those as 3 or 4 cartridges and are often 8 or even 12 for the same price.
I was on the gilette sensor double for a loong time but when prices went to $3-4 a head I had to quit.
I've tried all the major electrics and NONE comes close to a blade no matter what they say.
Here's the secret--------dry the blades when you're done.
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Seki double edge feather razor with feather stainless double edge blades.
Razor is $20 and blades are .50 each.
Takes a few days to learn how to shave with it, but I spend $1-2 a month now.
http://www.sekiedge.com/feather-popular-double-edge-razor