Yes, many companies use two or more methods of depreciation.

It is acceptable and common for companies to depreciate its plant assets by using the straight line method on its financial statements, while using an accelerated method on its income tax return.

A company could also be depreciating its equipment over ten years for its financial statements, while using seven years for its income tax return.

Even the depreciation for financial statements could consist of some assets being depreciated using the units of production or units of activity method, while other assets are depreciated using the straight line method.