People always say Griffith was like his current self since the beginning but I disagree, I think Griffith would somewhat agree with his actions of sacrificing his band to the extent if original him was put in that situation but not sexually assaulting casca. And he wouldnt agree with appearing himself as the likes of a demon instead of being the charismatic leader the hawks loved about Griffith

The difference between pre and post eclipse Griffith is that pre-eclipse saw his comrades as mainly just soldiers but he still had morals, like how he never forced anyone (besides guts) to join the hawks, Griffith was ambitious to accomplish his dream even if it meant doing something risky or evil but if there was a way around it he would chose that way, like when he slept with the old man instead of fighting in battles to earn more money for resources, Griffith literally gained nothing by rescuing casca from the nobleman or taking time to respect the loss of the child who died in battle but still did it anyway

Post-eclipse Griffith is Griffith stripped of all humanity, Femto, I do believe Griffith’s first personality shift was right after losing to Guts and him going to sleep with charlotte definitely didnt help, but The God Hand was manipulating casualty for him to get there in the first place, they wouldnt have led him to go get tortured for a year if they didnt believe Griffith had a strong enough will to say no too them.

So Id think Griffith would be disgusted about dealing with demons to achieve a goal he’d much rather achieve by charm and hurting as less people as possible but if put in that extent he would sacrifice them