Can I migrate Related products?

Yes, Cart2Cart supports migration of Related products (including upsell and cross-sell products) within a limited number of carts:

to/from Magento - related products, upsells, cross-sells
to/from WooCommerce - upsells, cross-sells
to/from 3dcart - related products, upsells
to/from Bigcommerce - related products
to/from Interspire - related products
to/from PrestaShop - related products
to/from CS-Cart - related products
to/from OpenCart - related products
to/from AceShop - related products
to/from MijoShop - related products
to/from MiwoShop - related products
to/from JooCart - related products
from AspDotNetStorefront - related products