If you held a multi rating on an Aztec then obviously you have completed training on retractable undercarriage and variable pitch propellers. You are not required to do further training ever. You do need to refer to your insurance policy in order to comply with their demands for the type.
I'm not keen on sellers giving conversion training because they tend to pass on bad habits and biases that may suit them and sometimes more likely influenced by bar talk prejudices. Over the years I've had to unravel too many problems for new owners because of this.