The comments came after Orsi, ex-president of defence and aerospace giant Finmeccanica, and Spagnolini, a former CEO of the company's helicopters subsidiary AgustaWestland, were acquitted by an Italian court today.
The officials said the same set of evidence had resulted in their conviction earlier.
The sources said the case in Italian courts is based on the evidence gathered by the Italian authorities whereas the CBI carried out a completely independent investigation in the matter.
"We have had a completely different probe. We have very strong case," CBI Spokesperson Abhishek Dayal said here.
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The case against Orsi and Spagnolini resulted from an investigation launched in 2012 by Italian authorities looking into alleged corruption into the sale of 12 helicopters to India for the use of VVIPs worth Rs 3600 crore.
The two were accused of international corruption and false invoicing in relation to bribes exchanged for the contract with India.
Both appealed against the conviction, while the prosecution appealed against the acquittal on the corruption charge.
In December 2016, the supreme court of cassation ordered a repeat of the appeals trial.
Milan's third court of appeal today acquitted Orsi and Spagnolini, who were serving four-and-a-half years and four years sentences under the charges.
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