different between moddable vs tweakable

English

mod +? -able

moddable (comparative more moddable, superlative most moddable)

(video games) That can be modded (modified by the end user).
- 2007, PC Hardware magazine
  To make things even more confusing, Garry's Mod is a "moddable" mod, meaning that users create modifications that plug into Garry's Mod itself.
- 2009, Paul McFedries, Tweak It and Freak It: A Killer Guide to Making Windows Run Your Way
  Strip off that veneer and a whole world comes into view, one that's eminently hackable, moddable, tweakable, customizable, and personalizable.

tweak +? -able

tweakable (comparative more tweakable, superlative most tweakable)

That can be tweaked; moddable, customizable.
(cryptography, not comparable) Of a block cipher: accepting a second input (the "tweak"), used in conjunction with the key to select the permutation computed by the cipher.

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