첫번째는 이거구요

Dear xxx

I’m Shin, working in sales team as Jonathan's colleague.

Good to know you. Call me 小申 or Shin.

Today I sent you the Shipping samples 10131 in 4 colours via FEDEX.

Please check the stuffs after you recieve and send e-mail back to me.

Waiting for your reply.

Best regards

두번째는 

Dear xxx

I’m Shin, working in sales team with Jonathan.

Good to know you. Call me 小申 or Shin.

Today I will send you Shipping samples of PK-C10131 in 4 colours via FEDEX

Please check the colours upon receipt and confirm back if it is ok with you.

Waiting for your reply.

Best regards

입니다.

두개 중에 어느게 더 자연스럽게 되어 있는지 좀 봐주세요.

그리고 각각 문법이나 틀린 문장 같은 거 좀 고쳐주실 수 있을까요... 혹은 어색한 걸

좀 자연스럽게 정정해주시면 더 감사하겠습니다.

좋은 하루 되세요