Shopify Product Cleanup & Clone

I have a master Shopify store holding roughly 3,200 SKUs. Before I roll these items out to my other storefronts, I need every product attribute brought into line—titles, variants, options, tags, metafields, SEO handles, anything that drives consistency across collections and search. Once the master data is clean, the finished catalogue must be copied into my additional Shopify stores so each one launches with identical, error-free information.

Deliverables
• Corrected attributes for all ~3,200 products in the master store
• Successful export/import or direct transfer of the revised catalogue into each target store, preserving images, inventory levels and variant relationships

Acceptance criteria
– No attribute discrepancies when spot-checking between stores
– Collections, filters and search behave the same way across every storefront
– All images render correctly and link paths are intact

Please let me know which method you prefer for the transfer (CSV, Matrixify, API, Shopify Plus multi-store tools, etc.) and an estimated timeline to complete the cleanup and cloning.