How to check the number of entities on Magento
1. To see the number of products, go to Catalog -> Manage Products. In the top of the table you will see the total quantity of products in your shopping cart.
However, there is a peculiarity- Magneto counts each product variant of configurable products as a separate one. Thus, the total number of products in Magento admin panel will be different from the one displayed on Migration Wizard during the transfer.
2. According to the same principle, check the number of:
- customers (Customers -> Manage Customers)
- and orders (Sales -> Orders).