Not really. When you copy and paste cells in Google Sheets, you only duplicate the data contained inside the cells, and not the cells themselves. If you tried to copy a checklist on Google Sheets, instead of checkboxes, Google Docs will display the word TRUE for any checkboxes that have been toggled on and FALSE for each that are toggled off. You can use this data to subsequently create checkboxes via the Format menu, but duplicating checkboxes themselves can’t be done.