The two numbers will probably be the same, unless you were in a Alternative Minimum Tax situation in prior years.
If you were you would have filed Form 6251. This is fairly unusual.
You find the amount of prior year depreciation from the "Form 4562 Depreciation and Amortization Report" that is included with your prior year tax return. This report includes all prior and current depreciation taken for the property since you placed it into service.
If you were in an Alternative Minimum Tax situation in prior years there would be an Alternative Minimum Tax Depreciation and Amortization Report included with your prior year tax return.
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