Yes, the CSIB on your ASU is the same size and style as the CSIB worn on your mess jacket. Miniature CSIB's are not on the market, and if they are, are not authorized for wear on either uniform. You will not need to purchase a new CSIB, unless you want one for each jacket.
Thank you for your service!

Only one CSIB can be worn at one time. I have included the regulation from DA PAM 670-1 below for reference.

Paragraph 20-17.e.(5): The combat service ID badge is worn on the wearer’s right side. The combat service ID badge is a pin-on badge authorized to be worn on the Army service/dress uniform and the mess and evening mess uniforms, in place of the SSI–FWTS. Personnel may wear only one combat service ID badge at a time. This badge is only authorized as a nonsubdued metal badge. This badge is not authorized for wear on combat or utility uniforms.

No, we do not sew on patches or provide any tailoring (hems, adjustments, etc.) to uniforms ordered online. They come completely unaltered. The reasoning is we do not wish to alter a uniform that may not fit to military spec. However, to help aid with the local alteration process, we do provide an alteration guide for you to give your local tailor when getting your uniform completed.

We would be happy to assist in re-mounting your miniature medals that you purchased from us in previous years. Without seeing the awards I can give you a rough estimate on the pricing.

New award: $12.50
Remounts: $5 ea. = $95 for 19 (we might not have to remount them all, it depends on the configuration with adding the VN COG award)
Return Shipping: $12
Total: $119.50

Please reach out to us at medals@marlowwhite.com if you have any further questions.