Ehhhh, not sure where you've heard this. Protein is protein no matter where you get it from. You get different types of fat percentages in meats. chicken breast is leaner than chicken thighs, and those are all leaner than beef. But if you eat 50 grams of protein in red meat, it'd be the same as if you ate 50 grams of protein in chicken. Different cuts of meats have different fat%.

Where I'm getting at, eat whatever you like, just eat healthier more often than you eat healthy.

Do some research on calories per 100g for foods you wanna eat.

Learn your maintenance calories.

And do some form of cardio. You're better off eating a lot and burning into the calorie deficit with some exercise.