To make same cost for FG item in fusion same as WMS. Do we need to change costing method to achieve

Oracle WMS and Fusion are implemented for our client, we are facing peculiar issue in perpetual average costing.

Job orders raise in WMS application and they will be created in fusion through integration.
Work order is triggered in WMS app and will be interfaced to fusion through integration. When work order is closed costing triggers and average costing happens.

Issue is cost of the Finished Goods is given in WMS as per the components used in workshop,
at times it will be 100 SAR or 150 SAR or 200 SAR like wise. Whenever the WO is interfaced to fusion gets completed and closed as well, we see the costing is happening based on Review Unit Cost with different amounts as expected.