Migrating from Shopify to Woocommerce - same domain, need 301 redirects?

Hi! I'm currently migrating my Shopify store to WooCommerce (same domain). I *don't* have access to the old Shopify backend. The new WooCommerce site is using a standard URL structure, same as it was in Shopify (`/products/product-name`). 1.Will I still need to create 301 redirects? I've heard conflicting information. 2.I'm aiming to preserve SEO as much as possible. Google Search Console shows 5.7K indexed pages, but I can only export 1000 directly. Any advice on handling redirects in this situation? Best tools/plugins? Any AI that can automate the process? Thanks!