yes
Definitely the same as. I don't think we ever use the same with. Well except for Person A: Oh no! I forgot to lock my house today. Person B. Same with Jenny. Which means, Jenny forgot to lock her...
No. KB (kilobytes) is a measurement of data (1000B, 8000b) Mg (megagrams) is a measurement of weight, (1,000,000 grams)
exact, matching, identical, alike, duplicate, twin; indistinguishable, interchangeable, corresponding, equivalent, parallel, like, comparable, similar, congruent, concordant, consonant.