htaccess redirect from old subdirectory site to new subdomain site

[Millie63]

hello

I have an old version of zencart (1.3.8) in a subdirectory. The site is live: www.mydomain.com/zencart

I have recently upgraded to 1.5.1 successfully and installed CEON URI mapping on the 1.5.1 test site in a subdomain : www.shop.mydomain.com and have uri mapped all the categories and products

mydomain.com included some .shtml files which I now have put up as ezpages on shop.mydomain.com

I want to redirect the old pages on mydomain.com/zencart to their equivalent pages in shop.mydomain.com. Eventually when testing is over I will move shop.mydomain.com to mydomain.com

I've tried to redirect a couple of the old pages (which are still live) to see if it works, but I haven't managed to. I've included the following in the .htaccess of the root (mydomain.com/zencart)

RewriteEngine On 
//301 Redirect Old File
Redirect 301 /zencart/index.php?main_page=product_info&cPath=3_23&products_id=27 http://www.shop.mydomain.com/category-fruit/subcategory-apples/redapples?cPath=3_23&

RedirectMatch 301 /zencart/index.php?main_page=index&cPath=3_23(.*)  http://www.shop.mydomain.com/category-fruit/subcategory-apples/$1

None of this worked and I still get mydomain.com/zencart rather than shop.mydomain.com

(Path 3 is category-fruit and path 23 is subcategory-apples, red apples are product 27 in the old version at mydomain.com/zencart). I kept the same categories/subcategories and products numbers on the new subdomain version shop.mydomain.com but now these have uri mapping. I'd like to be able to redirect the old unfriendly urls to the new uri mapped ones. I also have to redirect the old .shtml files to the ezpages. Also I'd like to prepare an .htaccess file for when I transfer from shop.mydomain.com to mydomain.com

Can anyone help to point me in the right direction please?

thanks
Millie