There are two types of generic Google Ads conversion metrics in Funnel - Conversions and All Conversions (explicitly called All Conv. in Funnel).
Conversions reflects the number of conversions for all conversion actions that you have opted into optimization in Google Ads. The conversion actions that are currently opted into optimization are displayed in the Google Ads UI in the Conversions view.
All Conversions is a best estimate of the total number of conversions that Google Ads drives. This metric includes website, cross-device, and phone call conversions as well as for example offline conversions that you have imported to Google Ads.
Please note that there are some conversions that has Include in "Conversions" set to No that can be found in the conversion setting of your Google Ads account. These conversions will not be pivoted in Funnel. These exists solely in the Conversion Name dimension with it's value in All Conversions. This is a limitation from the Adwords API. Please create a custom metric for this purpose.
If you experience a mismatch in the number of conversions between Google Ads and Funnel, make sure you are comparing the same metrics. If there are still differences in the data please reach out to Funnel support.