Different membership receipts for 'New' and 'Active' members
In the smarty template the variable $mem_status is assigned. So it can be used to insert different text fragments in the template. Here is an example in code.

 {if $mem_status eq 'New'}
 Hello, you seem to be new so this is the text fragment for new members.
 {else}
 Welcome back - not new - so here is an active member text fragment.
 {/if}