Compare quotations only after the model, included accessories, quantity, packing basis and destination are aligned. A lower unit price can still represent a different scope.
Put every offer into the same table and compare the exact configuration, included components, commercial terms, logistics and written warranty. Do not compare one supplier's base machine with another supplier's fully equipped model.
A quotation can exclude packing protection, destination handling, customs, unloading or a second package. Another offer can include more springs or accessories, use a different construction, or state a different warranty. The comparison should show what is inside each scope before comparing the final amount.
Ask each supplier to restate the selected model, quantity, unit price, included parts, packed dimensions, gross weight, delivery basis, excluded costs, lead time and warranty. Then use the same list for both offers.