The difference between Same and Selfsame

When used as adjectives, same means not different or other, whereas selfsame means precisely the same.

Same is also pronoun with the meaning: the identical thing, ditto.

Same is also adverb with the meaning: together.

check bellow for the other definitions of Same and Selfsame

Same as an adjective:

Not different or other; not another or others; not different as regards self; selfsame; identical.

Examples:

"Are you the same person who phoned me yesterday?"

"I realised I was the same age as my grandfather had been when he joined the air force."

"Even if the twins are identical, they are still not the same person, unlike Mark Twain and Samuel Clemens."

"Peter and Anna went to the same high school: the high school to which Peter went is the high school to which Anna went."
Same as an adjective:

Similar, alike.

Examples:

"You have the same hair I do!"
Same as an adjective:

Used to express the unity of an object or person which has various different descriptions or qualities.

Examples:

"Round here it can be cloudy and sunny even in the same day."

"We were all going in the same direction."
Same as an adjective:

A reply of confirmation of identity.

Same as a pronoun:

The identical thing, ditto.

Examples:

"The same can be said of him."

"It's the same everywhere."
Same as a pronoun:

Something similar, something of the identical type.

Examples:

"She's having apple pie? I'll have the same. You two are just the same."
Same as a pronoun (formal, often, legal):

It or them, without a connotation of similarity.

Examples:

"The question is his credibility or lack of same."

"Light valve suspensions and films containing UV absorbers and light valves containing the same'' (US Patent 5,467,217)"

"Methods of selectively distributing data in a computer network and systems using the same'' (US Patent 7,191,208)"
Same as a pronoun (Indian English, common):

It or them, as above, meaning the last object mentioned, mainly as complement: on the same, for the same.

Examples:

"My picture/photography blog...kindly give me your reviews on the same."

Selfsame as an adjective:

Precisely the same; the very same; identical.